The port-forwarding is working OK from outside the LAN. Inside the LAN it seems to be working except that it is verrrrrrrrrrry slooooooooooooow. The router manufacturer (NETGEAR) claims that it cannot be done at all. I am fairly certain that the problem originates within the router itself, and not either the WAN interface (ADSL modem) or the domain server within the LAN.
I could be wrong but this seems to be a common application, at least for me. If I set up any kind of a server service I always test it both inside and outside of its LAN. In other words I attempt to address the service with both the local IP (192.168.......) and its Internet equivalent which in this case is a static IP assigned by the ISP (becoming the router WAN address).
Most of the time I would like for the results to be the same. That way I can hard-code the Internet-based static IP address into applications (web, SQL, Access linked tables, etc.), and it would work regardless of where the client is.
I would like to know if this concept has a name in networking jargon. It seems similar to the concept of a "loopback" test.
I thank you for your help. As I said, I'm not a networking techie because that's not my line of work. But sometimes networking problems definitely affect my work.